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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [acpi/] [system.c] - Blame information for rev 1774

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/*
 *  acpi_system.c - ACPI System Driver ($Revision: 1.1.1.1 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
 
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/poll.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/sysrq.h>
#include <linux/compatmac.h>
#include <linux/proc_fs.h>
#include <linux/pm.h>
#include <asm/uaccess.h>
#include <asm/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/sched.h>
 
#ifdef CONFIG_ACPI_SLEEP
#include <linux/mc146818rtc.h>
#include <linux/irq.h>
#include <asm/hw_irq.h>
 
acpi_status acpi_system_save_state(u32);
#else
static inline acpi_status acpi_system_save_state(u32 state)
{
        return AE_OK;
}
#endif /* !CONFIG_ACPI_SLEEP */
 
#define _COMPONENT              ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME                ("acpi_system")
 
#define PREFIX                  "ACPI: "
 
extern FADT_DESCRIPTOR          acpi_fadt;
 
static int acpi_system_add (struct acpi_device *device);
static int acpi_system_remove (struct acpi_device *device, int type);
 
acpi_status acpi_suspend (u32 state);
 
static struct acpi_driver acpi_system_driver = {
        .name =         ACPI_SYSTEM_DRIVER_NAME,
        .class =        ACPI_SYSTEM_CLASS,
        .ids =          ACPI_SYSTEM_HID,
        .ops =          {
                                .add =          acpi_system_add,
                                .remove =       acpi_system_remove
                        },
};
 
struct acpi_system
{
        acpi_handle             handle;
        u8                      states[ACPI_S_STATE_COUNT];
};
 
/* Global vars for handling event proc entry */
static spinlock_t               acpi_system_event_lock = SPIN_LOCK_UNLOCKED;
int                             event_is_open = 0;
extern struct list_head         acpi_bus_event_list;
extern wait_queue_head_t        acpi_bus_event_queue;
 
/* --------------------------------------------------------------------------
                                  System Sleep
   -------------------------------------------------------------------------- */
 
#ifdef CONFIG_PM
 
static void
acpi_power_off (void)
{
        if (unlikely(in_interrupt()))
                BUG();
        /* Some SMP machines only can poweroff in boot CPU */
        set_cpus_allowed(current, 1UL << cpu_logical_map(0));
        acpi_system_save_state(ACPI_STATE_S5);
        acpi_enter_sleep_state_prep(ACPI_STATE_S5);
        ACPI_DISABLE_IRQS();
        acpi_enter_sleep_state(ACPI_STATE_S5);
 
        printk(KERN_EMERG "ACPI: can not power off machine\n");
}
 
#endif /*CONFIG_PM*/
 
 
#ifdef CONFIG_ACPI_SLEEP
 
/**
 * acpi_system_restore_state - OS-specific restoration of state
 * @state:      sleep state we're exiting
 *
 * Note that if we're coming back from S4, the memory image should have
 * already been loaded from the disk and is already in place.  (Otherwise how
 * else would we be here?).
 */
acpi_status
acpi_system_restore_state(
        u32                     state)
{
        /*
         * We should only be here if we're coming back from STR or STD.
         * And, in the case of the latter, the memory image should have already
         * been loaded from disk.
         */
        if (state > ACPI_STATE_S1) {
                acpi_restore_state_mem();
 
                /* Do _early_ resume for irqs.  Required by
                 * ACPI specs.
                 */
                /* TBD: call arch dependant reinitialization of the
                 * interrupts.
                 */
#ifdef CONFIG_X86
                init_8259A(0);
#endif
                /* wait for power to come back */
                mdelay(1000);
 
        }
 
        /* Be really sure that irqs are disabled. */
        ACPI_DISABLE_IRQS();
 
        /* Wait a little again, just in case... */
        mdelay(1000);
 
        /* enable interrupts once again */
        ACPI_ENABLE_IRQS();
 
        /* turn all the devices back on */
        if (state > ACPI_STATE_S1)
                pm_send_all(PM_RESUME, (void *)0);
 
        return AE_OK;
}
 
 
/**
 * acpi_system_save_state - save OS specific state and power down devices
 * @state:      sleep state we're entering.
 *
 * This handles saving all context to memory, and possibly disk.
 * First, we call to the device driver layer to save device state.
 * Once we have that, we save whatevery processor and kernel state we
 * need to memory.
 * If we're entering S4, we then write the memory image to disk.
 *
 * Only then it is safe for us to power down devices, since we may need
 * the disks and upstream buses to write to.
 */
acpi_status
acpi_system_save_state(
        u32                     state)
{
        int                     error = 0;
 
        /* Send notification to devices that they will be suspended.
         * If any device or driver cannot make the transition, either up
         * or down, we'll get an error back.
         */
        if (state > ACPI_STATE_S1) {
                error = pm_send_all(PM_SAVE_STATE, (void *)3);
                if (error)
                        return AE_ERROR;
        }
 
        if (state <= ACPI_STATE_S5) {
                /* Tell devices to stop I/O and actually save their state.
                 * It is theoretically possible that something could fail,
                 * so handle that gracefully..
                 */
                if (state > ACPI_STATE_S1 && state != ACPI_STATE_S5) {
                        error = pm_send_all(PM_SUSPEND, (void *)3);
                        if (error) {
                                /* Tell devices to restore state if they have
                                 * it saved and to start taking I/O requests.
                                 */
                                pm_send_all(PM_RESUME, (void *)0);
                                return error;
                        }
                }
 
                /* flush caches */
                ACPI_FLUSH_CPU_CACHE();
 
                /* Do arch specific saving of state. */
                if (state > ACPI_STATE_S1) {
                        error = acpi_save_state_mem();
 
                        /* TBD: if no s4bios, write codes for
                         * acpi_save_state_disk()...
                         */
#if 0
                        if (!error && (state == ACPI_STATE_S4))
                                error = acpi_save_state_disk();
#endif
                        if (error) {
                                pm_send_all(PM_RESUME, (void *)0);
                                return error;
                        }
                }
        }
        /* disable interrupts
         * Note that acpi_suspend -- our caller -- will do this once we return.
         * But, we want it done early, so we don't get any suprises during
         * the device suspend sequence.
         */
        ACPI_DISABLE_IRQS();
 
        /* Unconditionally turn off devices.
         * Obvious if we enter a sleep state.
         * If entering S5 (soft off), this should put devices in a
         * quiescent state.
         */
 
        if (state > ACPI_STATE_S1) {
                error = pm_send_all(PM_SUSPEND, (void *)3);
 
                /* We're pretty screwed if we got an error from this.
                 * We try to recover by simply calling our own restore_state
                 * function; see above for definition.
                 *
                 * If it's S5 though, go through with it anyway..
                 */
                if (error && state != ACPI_STATE_S5)
                        acpi_system_restore_state(state);
        }
        return error ? AE_ERROR : AE_OK;
}
 
 
/****************************************************************************
 *
 * FUNCTION:    acpi_system_suspend
 *
 * PARAMETERS:  %state: Sleep state to enter.
 *
 * RETURN:      acpi_status, whether or not we successfully entered and
 *              exited sleep.
 *
 * DESCRIPTION: Perform OS-specific action to enter sleep state.
 *              This is the final step in going to sleep, per spec.  If we
 *              know we're coming back (i.e. not entering S5), we save the
 *              processor flags. [ We'll have to save and restore them anyway,
 *              so we use the arch-agnostic save_flags and restore_flags
 *              here.]  We then set the place to return to in arch-specific
 *              globals using arch_set_return_point. Finally, we call the
 *              ACPI function to write the proper values to I/O ports.
 *
 ****************************************************************************/
 
acpi_status
acpi_system_suspend(
        u32             state)
{
        acpi_status             status = AE_ERROR;
        unsigned long           flags = 0;
 
        local_irq_save(flags);
        /* kernel_fpu_begin(); */
 
        switch (state) {
        case ACPI_STATE_S1:
        case ACPI_STATE_S5:
                barrier();
                status = acpi_enter_sleep_state(state);
                break;
        case ACPI_STATE_S4:
                do_suspend_lowlevel_s4bios(0);
                break;
        }
 
        /* kernel_fpu_end(); */
        local_irq_restore(flags);
 
        return status;
}
 
 
 
/**
 * acpi_suspend - OS-agnostic system suspend/resume support (S? states)
 * @state:      state we're entering
 *
 */
acpi_status
acpi_suspend (
        u32                     state)
{
        acpi_status status;
 
        /* only support S1 and S5 on kernel 2.4 */
        if (state != ACPI_STATE_S1 && state != ACPI_STATE_S4
            && state != ACPI_STATE_S5)
                return AE_ERROR;
 
 
        if (ACPI_STATE_S4 == state) {
                /* For s4bios, we need a wakeup address. */
                if (1 == acpi_gbl_FACS->S4bios_f &&
 
                        if (!acpi_wakeup_address)
                                return AE_ERROR;
                        acpi_set_firmware_waking_vector((acpi_physical_address) acpi_wakeup_address);
                } else
                        /* We don't support S4 under 2.4.  Give up */
                        return AE_ERROR;
        }
 
        status = acpi_system_save_state(state);
        if (!ACPI_SUCCESS(status) && state != ACPI_STATE_S5)
                return status;
 
        acpi_enter_sleep_state_prep(state);
 
        /* disable interrupts and flush caches */
        ACPI_DISABLE_IRQS();
        ACPI_FLUSH_CPU_CACHE();
 
        /* perform OS-specific sleep actions */
        status = acpi_system_suspend(state);
 
        /* Even if we failed to go to sleep, all of the devices are in an suspended
         * mode. So, we run these unconditionaly to make sure we have a usable system
         * no matter what.
         */
        acpi_leave_sleep_state(state);
        acpi_system_restore_state(state);
 
        /* make sure interrupts are enabled */
        ACPI_ENABLE_IRQS();
 
        /* reset firmware waking vector */
        acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 
        return status;
}
 
#endif /* CONFIG_ACPI_SLEEP */
 
 
/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */
 
static int
acpi_system_read_info (
        char                    *page,
        char                    **start,
        off_t                   off,
        int                     count,
        int                     *eof,
        void                    *data)
{
        struct acpi_system      *system = (struct acpi_system *) data;
        char                    *p = page;
        int                     size = 0;
        u32                     i = 0;
 
        ACPI_FUNCTION_TRACE("acpi_system_read_info");
 
        if (!system || (off != 0))
                goto end;
 
        p += sprintf(p, "version:                 %x\n", ACPI_CA_VERSION);
 
        p += sprintf(p, "states:                  ");
        for (i=0; i<ACPI_S_STATE_COUNT; i++) {
                if (system->states[i]) {
                        p += sprintf(p, "S%d ", i);
                        if (i == ACPI_STATE_S4 &&
                            acpi_gbl_FACS->S4bios_f &&
 
                                p += sprintf(p, "S4Bios ");
                }
        }
        p += sprintf(p, "\n");
 
end:
        size = (p - page);
        if (size <= off+count) *eof = 1;
        *start = page + off;
        size -= off;
        if (size>count) size = count;
        if (size<0) size = 0;
 
        return_VALUE(size);
}
 
static int acpi_system_open_event(struct inode *inode, struct file *file);
static ssize_t acpi_system_read_event (struct file*, char*, size_t, loff_t*);
static int acpi_system_close_event(struct inode *inode, struct file *file);
static unsigned int acpi_system_poll_event(struct file *file, poll_table *wait);
 
 
static struct file_operations acpi_system_event_ops = {
        .open =         acpi_system_open_event,
        .read =         acpi_system_read_event,
        .release =      acpi_system_close_event,
        .poll =         acpi_system_poll_event,
};
 
static int
acpi_system_open_event(struct inode *inode, struct file *file)
{
        spin_lock_irq (&acpi_system_event_lock);
 
        if(event_is_open)
                goto out_busy;
 
        event_is_open = 1;
 
        spin_unlock_irq (&acpi_system_event_lock);
        return 0;
 
out_busy:
        spin_unlock_irq (&acpi_system_event_lock);
        return -EBUSY;
}
 
static ssize_t
acpi_system_read_event (
        struct file             *file,
        char                    *buffer,
        size_t                  count,
        loff_t                  *ppos)
{
        int                     result = 0;
        struct acpi_bus_event   event;
        static char             str[ACPI_MAX_STRING];
        static int              chars_remaining = 0;
        static char             *ptr;
 
 
        ACPI_FUNCTION_TRACE("acpi_system_read_event");
 
        if (!chars_remaining) {
                memset(&event, 0, sizeof(struct acpi_bus_event));
 
                if ((file->f_flags & O_NONBLOCK)
                    && (list_empty(&acpi_bus_event_list)))
                        return_VALUE(-EAGAIN);
 
                result = acpi_bus_receive_event(&event);
                if (result) {
                        return_VALUE(-EIO);
                }
 
                chars_remaining = sprintf(str, "%s %s %08x %08x\n",
                        event.device_class?event.device_class:"<unknown>",
                        event.bus_id?event.bus_id:"<unknown>",
                        event.type, event.data);
                ptr = str;
        }
 
        if (chars_remaining < count) {
                count = chars_remaining;
        }
 
        if (copy_to_user(buffer, ptr, count))
                return_VALUE(-EFAULT);
 
        *ppos += count;
        chars_remaining -= count;
        ptr += count;
 
        return_VALUE(count);
}
 
static int
acpi_system_close_event(struct inode *inode, struct file *file)
{
        spin_lock_irq (&acpi_system_event_lock);
        event_is_open = 0;
        spin_unlock_irq (&acpi_system_event_lock);
        return 0;
}
 
static unsigned int
acpi_system_poll_event(
        struct file             *file,
        poll_table              *wait)
{
        poll_wait(file, &acpi_bus_event_queue, wait);
        if (!list_empty(&acpi_bus_event_list))
                return POLLIN | POLLRDNORM;
        return 0;
}
 
static ssize_t acpi_system_read_dsdt (struct file*, char*, size_t, loff_t*);
 
static struct file_operations acpi_system_dsdt_ops = {
        .read =                 acpi_system_read_dsdt,
};
 
static ssize_t
acpi_system_read_dsdt (
        struct file             *file,
        char                    *buffer,
        size_t                  count,
        loff_t                  *ppos)
{
        acpi_status             status = AE_OK;
        struct acpi_buffer      dsdt = {ACPI_ALLOCATE_BUFFER, NULL};
        void                    *data = 0;
        size_t                  size = 0;
 
        ACPI_FUNCTION_TRACE("acpi_system_read_dsdt");
 
        status = acpi_get_table(ACPI_TABLE_DSDT, 1, &dsdt);
        if (ACPI_FAILURE(status))
                return_VALUE(-ENODEV);
 
        if (*ppos < dsdt.length) {
                data = dsdt.pointer + file->f_pos;
                size = dsdt.length - file->f_pos;
                if (size > count)
                        size = count;
                if (copy_to_user(buffer, data, size)) {
                        acpi_os_free(dsdt.pointer);
                        return_VALUE(-EFAULT);
                }
        }
 
        acpi_os_free(dsdt.pointer);
 
        *ppos += size;
 
        return_VALUE(size);
}
 
 
static ssize_t acpi_system_read_fadt (struct file*, char*, size_t, loff_t*);
 
static struct file_operations acpi_system_fadt_ops = {
        .read =                 acpi_system_read_fadt,
};
 
static ssize_t
acpi_system_read_fadt (
        struct file             *file,
        char                    *buffer,
        size_t                  count,
        loff_t                  *ppos)
{
        acpi_status             status = AE_OK;
        struct acpi_buffer      fadt = {ACPI_ALLOCATE_BUFFER, NULL};
        void                    *data = 0;
        size_t                  size = 0;
 
        ACPI_FUNCTION_TRACE("acpi_system_read_fadt");
 
        status = acpi_get_table(ACPI_TABLE_FADT, 1, &fadt);
        if (ACPI_FAILURE(status))
                return_VALUE(-ENODEV);
 
        if (*ppos < fadt.length) {
                data = fadt.pointer + file->f_pos;
                size = fadt.length - file->f_pos;
                if (size > count)
                        size = count;
                if (copy_to_user(buffer, data, size)) {
                        acpi_os_free(fadt.pointer);
                        return_VALUE(-EFAULT);
                }
        }
 
        acpi_os_free(fadt.pointer);
 
        *ppos += size;
 
        return_VALUE(size);
}
 
 
#ifdef ACPI_DEBUG_OUTPUT
 
static int
acpi_system_read_debug (
        char                    *page,
        char                    **start,
        off_t                   off,
        int                     count,
        int                     *eof,
        void                    *data)
{
        char                    *p = page;
        int                     size = 0;
 
        if (off != 0)
                goto end;
 
        switch ((unsigned long) data) {
        case 0:
                p += sprintf(p, "0x%08x\n", acpi_dbg_layer);
                break;
        case 1:
                p += sprintf(p, "0x%08x\n", acpi_dbg_level);
                break;
        default:
                p += sprintf(p, "Invalid debug option\n");
                break;
        }
 
end:
        size = (p - page);
        if (size <= off+count) *eof = 1;
        *start = page + off;
        size -= off;
        if (size>count) size = count;
        if (size<0) size = 0;
 
        return size;
}
 
 
static int
acpi_system_write_debug (
        struct file             *file,
        const char              *buffer,
        unsigned long           count,
        void                    *data)
{
        char                    debug_string[12] = {'\0'};
 
        ACPI_FUNCTION_TRACE("acpi_system_write_debug");
 
        if (count > sizeof(debug_string) - 1)
                return_VALUE(-EINVAL);
 
        if (copy_from_user(debug_string, buffer, count))
                return_VALUE(-EFAULT);
 
        debug_string[count] = '\0';
 
        switch ((unsigned long) data) {
        case 0:
                acpi_dbg_layer = simple_strtoul(debug_string, NULL, 0);
                break;
        case 1:
                acpi_dbg_level = simple_strtoul(debug_string, NULL, 0);
                break;
        default:
                return_VALUE(-EINVAL);
        }
 
        return_VALUE(count);
}
 
#endif /* ACPI_DEBUG_OUTPUT */
 
 
#ifdef CONFIG_ACPI_SLEEP
 
static int
acpi_system_read_sleep (
        char                    *page,
        char                    **start,
        off_t                   off,
        int                     count,
        int                     *eof,
        void                    *data)
{
        struct acpi_system      *system = (struct acpi_system *) data;
        char                    *p = page;
        int                     size;
        int                     i;
 
        ACPI_FUNCTION_TRACE("acpi_system_read_sleep");
 
        if (!system || (off != 0))
                goto end;
 
        for (i = 0; i <= ACPI_STATE_S5; i++) {
                if (system->states[i]) {
                        p += sprintf(p,"S%d ", i);
                        if (i == ACPI_STATE_S4 && acpi_gbl_FACS->S4bios_f &&
                            acpi_gbl_FADT->smi_cmd != 0)
                                p += sprintf(p, "S4Bios ");
                }
        }
 
        p += sprintf(p, "\n");
 
end:
        size = (p - page);
        if (size <= off+count) *eof = 1;
        *start = page + off;
        size -= off;
        if (size>count) size = count;
        if (size<0) size = 0;
 
        return_VALUE(size);
}
 
 
static int
acpi_system_write_sleep (
        struct file             *file,
        const char              *buffer,
        unsigned long           count,
        void                    *data)
{
        acpi_status             status = AE_OK;
        struct acpi_system      *system = (struct acpi_system *) data;
        char                    state_string[12] = {'\0'};
        u32                     state = 0;
 
        ACPI_FUNCTION_TRACE("acpi_system_write_sleep");
 
        if (!system || (count > sizeof(state_string) - 1))
                return_VALUE(-EINVAL);
 
        if (copy_from_user(state_string, buffer, count))
                return_VALUE(-EFAULT);
 
        state_string[count] = '\0';
 
        state = simple_strtoul(state_string, NULL, 0);
 
        if (!system->states[state])
                return_VALUE(-ENODEV);
 
        /*
         * If S4 is supported by the OS, then we should assume that
         * echo 4b > /proc/acpi/sleep is for s4bios.
         * Since we have only s4bios, we assume that acpi_suspend failed
         * if no s4bios support.
         */
        status = acpi_suspend(state);
        if (ACPI_FAILURE(status))
                return_VALUE(-ENODEV);
 
        return_VALUE(count);
}
 
 
static int
acpi_system_read_alarm (
        char                    *page,
        char                    **start,
        off_t                   off,
        int                     count,
        int                     *eof,
        void                    *context)
{
        char                    *p = page;
        int                     size = 0;
        u32                     sec, min, hr;
        u32                     day, mo, yr;
 
        ACPI_FUNCTION_TRACE("acpi_system_read_alarm");
 
        if (off != 0)
                goto end;
 
        spin_lock(&rtc_lock);
 
        sec = CMOS_READ(RTC_SECONDS_ALARM);
        min = CMOS_READ(RTC_MINUTES_ALARM);
        hr = CMOS_READ(RTC_HOURS_ALARM);
 
#if 0   /* If we ever get an FACP with proper values... */
        if (acpi_gbl_FADT->day_alrm)
                day = CMOS_READ(acpi_gbl_FADT->day_alrm);
        else
                day =  CMOS_READ(RTC_DAY_OF_MONTH);
        if (acpi_gbl_FADT->mon_alrm)
                mo = CMOS_READ(acpi_gbl_FADT->mon_alrm);
        else
                mo = CMOS_READ(RTC_MONTH);;
        if (acpi_gbl_FADT->century)
                yr = CMOS_READ(acpi_gbl_FADT->century) * 100 + CMOS_READ(RTC_YEAR);
        else
                yr = CMOS_READ(RTC_YEAR);
#else
        day = CMOS_READ(RTC_DAY_OF_MONTH);
        mo = CMOS_READ(RTC_MONTH);
        yr = CMOS_READ(RTC_YEAR);
#endif
 
        spin_unlock(&rtc_lock);
 
        BCD_TO_BIN(sec);
        BCD_TO_BIN(min);
        BCD_TO_BIN(hr);
        BCD_TO_BIN(day);
        BCD_TO_BIN(mo);
        BCD_TO_BIN(yr);
 
#if 0
        /* we're trusting the FADT (see above)*/
#else
        /* If we're not trusting the FADT, we should at least make it
         * right for _this_ century... ehm, what is _this_ century?
         *
         * TBD:
         *  ASAP: find piece of code in the kernel, e.g. star tracker driver,
         *        which we can trust to determine the century correctly. Atom
         *        watch driver would be nice, too...
         *
         *  if that has not happened, change for first release in 2050:
         *        if (yr<50)
         *                yr += 2100;
         *        else
         *                yr += 2000;   // current line of code
         *
         *  if that has not happened either, please do on 2099/12/31:23:59:59
         *        s/2000/2100
         *
         */
        yr += 2000;
#endif
 
        p += sprintf(p,"%4.4u-", yr);
        p += (mo > 12)  ? sprintf(p, "**-")  : sprintf(p, "%2.2u-", mo);
        p += (day > 31) ? sprintf(p, "** ")  : sprintf(p, "%2.2u ", day);
        p += (hr > 23)  ? sprintf(p, "**:")  : sprintf(p, "%2.2u:", hr);
        p += (min > 59) ? sprintf(p, "**:")  : sprintf(p, "%2.2u:", min);
        p += (sec > 59) ? sprintf(p, "**\n") : sprintf(p, "%2.2u\n", sec);
 
 end:
        size = p - page;
        if (size < count) *eof = 1;
        else if (size > count) size = count;
        if (size < 0) size = 0;
        *start = page;
 
        return_VALUE(size);
}
 
 
static int
get_date_field (
        char                    **p,
        u32                     *value)
{
        char                    *next = NULL;
        char                    *string_end = NULL;
        int                     result = -EINVAL;
 
        /*
         * Try to find delimeter, only to insert null.  The end of the
         * string won't have one, but is still valid.
         */
        next = strpbrk(*p, "- :");
        if (next)
                *next++ = '\0';
 
        *value = simple_strtoul(*p, &string_end, 10);
 
        /* Signal success if we got a good digit */
        if (string_end != *p)
                result = 0;
 
        if (next)
                *p = next;
 
        return result;
}
 
 
static int
acpi_system_write_alarm (
        struct file             *file,
        const char              *buffer,
        unsigned long           count,
        void                    *data)
{
        int                     result = 0;
        char                    alarm_string[30] = {'\0'};
        char                    *p = alarm_string;
        u32                     sec, min, hr, day, mo, yr;
        int                     adjust = 0;
        unsigned char           rtc_control = 0;
 
        ACPI_FUNCTION_TRACE("acpi_system_write_alarm");
 
        if (count > sizeof(alarm_string) - 1)
                return_VALUE(-EINVAL);
 
        if (copy_from_user(alarm_string, buffer, count))
                return_VALUE(-EFAULT);
 
        alarm_string[count] = '\0';
 
        /* check for time adjustment */
        if (alarm_string[0] == '+') {
                p++;
                adjust = 1;
        }
 
        if ((result = get_date_field(&p, &yr)))
                goto end;
        if ((result = get_date_field(&p, &mo)))
                goto end;
        if ((result = get_date_field(&p, &day)))
                goto end;
        if ((result = get_date_field(&p, &hr)))
                goto end;
        if ((result = get_date_field(&p, &min)))
                goto end;
        if ((result = get_date_field(&p, &sec)))
                goto end;
 
        if (sec > 59) {
                min += 1;
                sec -= 60;
        }
        if (min > 59) {
                hr += 1;
                min -= 60;
        }
        if (hr > 23) {
                day += 1;
                hr -= 24;
        }
        if (day > 31) {
                mo += 1;
                day -= 31;
        }
        if (mo > 12) {
                yr += 1;
                mo -= 12;
        }
 
        spin_lock_irq(&rtc_lock);
 
        rtc_control = CMOS_READ(RTC_CONTROL);
        if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
                BIN_TO_BCD(yr);
                BIN_TO_BCD(mo);
                BIN_TO_BCD(day);
                BIN_TO_BCD(hr);
                BIN_TO_BCD(min);
                BIN_TO_BCD(sec);
        }
 
        if (adjust) {
                yr  += CMOS_READ(RTC_YEAR);
                mo  += CMOS_READ(RTC_MONTH);
                day += CMOS_READ(RTC_DAY_OF_MONTH);
                hr  += CMOS_READ(RTC_HOURS);
                min += CMOS_READ(RTC_MINUTES);
                sec += CMOS_READ(RTC_SECONDS);
        }
 
        spin_unlock_irq(&rtc_lock);
 
        if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
                BCD_TO_BIN(yr);
                BCD_TO_BIN(mo);
                BCD_TO_BIN(day);
                BCD_TO_BIN(hr);
                BCD_TO_BIN(min);
                BCD_TO_BIN(sec);
        }
 
        if (sec > 59) {
                min++;
                sec -= 60;
        }
        if (min > 59) {
                hr++;
                min -= 60;
        }
        if (hr > 23) {
                day++;
                hr -= 24;
        }
        if (day > 31) {
                mo++;
                day -= 31;
        }
        if (mo > 12) {
                yr++;
                mo -= 12;
        }
        if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
                BIN_TO_BCD(yr);
                BIN_TO_BCD(mo);
                BIN_TO_BCD(day);
                BIN_TO_BCD(hr);
                BIN_TO_BCD(min);
                BIN_TO_BCD(sec);
        }
 
        spin_lock_irq(&rtc_lock);
 
        /* write the fields the rtc knows about */
        CMOS_WRITE(hr, RTC_HOURS_ALARM);
        CMOS_WRITE(min, RTC_MINUTES_ALARM);
        CMOS_WRITE(sec, RTC_SECONDS_ALARM);
 
        /*
         * If the system supports an enhanced alarm it will have non-zero
         * offsets into the CMOS RAM here -- which for some reason are pointing
         * to the RTC area of memory.
         */
#if 0
        if (acpi_gbl_FADT->day_alrm)
                CMOS_WRITE(day, acpi_gbl_FADT->day_alrm);
        if (acpi_gbl_FADT->mon_alrm)
                CMOS_WRITE(mo, acpi_gbl_FADT->mon_alrm);
        if (acpi_gbl_FADT->century)
                CMOS_WRITE(yr/100, acpi_gbl_FADT->century);
#endif
        /* enable the rtc alarm interrupt */
        if (!(rtc_control & RTC_AIE)) {
                rtc_control |= RTC_AIE;
                CMOS_WRITE(rtc_control,RTC_CONTROL);
                CMOS_READ(RTC_INTR_FLAGS);
        }
 
        spin_unlock_irq(&rtc_lock);
 
        acpi_set_register(ACPI_BITREG_RT_CLOCK_ENABLE, 1, ACPI_MTX_LOCK);
 
        file->f_pos += count;
 
        result = 0;
end:
        return_VALUE(result ? result : count);
}
 
#endif /*CONFIG_ACPI_SLEEP*/
 
 
static int
acpi_system_add_fs (
        struct acpi_device      *device)
{
        struct proc_dir_entry   *entry = NULL;
 
        ACPI_FUNCTION_TRACE("acpi_system_add_fs");
 
        if (!device)
                return_VALUE(-EINVAL);
 
        /* 'info' [R] */
        entry = create_proc_entry(ACPI_SYSTEM_FILE_INFO,
                S_IRUGO, acpi_device_dir(device));
        if (!entry)
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                        "Unable to create '%s' fs entry\n",
                        ACPI_SYSTEM_FILE_INFO));
        else {
                entry->read_proc = acpi_system_read_info;
                entry->data = acpi_driver_data(device);
        }
 
        /* 'dsdt' [R] */
        entry = create_proc_entry(ACPI_SYSTEM_FILE_DSDT,
                S_IRUSR, acpi_device_dir(device));
        if (!entry)
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                        "Unable to create '%s' fs entry\n",
                        ACPI_SYSTEM_FILE_DSDT));
        else
                entry->proc_fops = &acpi_system_dsdt_ops;
 
        /* 'fadt' [R] */
        entry = create_proc_entry(ACPI_SYSTEM_FILE_FADT,
                S_IRUSR, acpi_device_dir(device));
        if (!entry)
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                        "Unable to create '%s' fs entry\n",
                        ACPI_SYSTEM_FILE_FADT));
        else
                entry->proc_fops = &acpi_system_fadt_ops;
 
        /* 'event' [R] */
        entry = create_proc_entry(ACPI_SYSTEM_FILE_EVENT,
                S_IRUSR, acpi_device_dir(device));
        if (!entry)
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                        "Unable to create '%s' fs entry\n",
                        ACPI_SYSTEM_FILE_EVENT));
        else
                entry->proc_fops = &acpi_system_event_ops;
 
#ifdef CONFIG_ACPI_SLEEP
 
        /* 'sleep' [R/W]*/
        entry = create_proc_entry(ACPI_SYSTEM_FILE_SLEEP,
                S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
        if (!entry)
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                        "Unable to create '%s' fs entry\n",
                        ACPI_SYSTEM_FILE_SLEEP));
        else {
                entry->read_proc = acpi_system_read_sleep;
                entry->write_proc = acpi_system_write_sleep;
                entry->data = acpi_driver_data(device);
        }
 
        /* 'alarm' [R/W] */
        entry = create_proc_entry(ACPI_SYSTEM_FILE_ALARM,
                S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
        if (!entry)
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                        "Unable to create '%s' fs entry\n",
                        ACPI_SYSTEM_FILE_ALARM));
        else {
                entry->read_proc = acpi_system_read_alarm;
                entry->write_proc = acpi_system_write_alarm;
                entry->data = acpi_driver_data(device);
        }
 
#endif /*CONFIG_ACPI_SLEEP*/
 
#ifdef ACPI_DEBUG_OUTPUT
 
        /* 'debug_layer' [R/W] */
        entry = create_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER,
                S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
        if (!entry)
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                        "Unable to create '%s' fs entry\n",
                        ACPI_SYSTEM_FILE_DEBUG_LAYER));
        else {
                entry->read_proc  = acpi_system_read_debug;
                entry->write_proc = acpi_system_write_debug;
                entry->data = (void *) 0;
        }
 
        /* 'debug_level' [R/W] */
        entry = create_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL,
                S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
        if (!entry)
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                        "Unable to create '%s' fs entry\n",
                        ACPI_SYSTEM_FILE_DEBUG_LEVEL));
        else {
                entry->read_proc  = acpi_system_read_debug;
                entry->write_proc = acpi_system_write_debug;
                entry->data = (void *) 1;
        }
 
#endif /*ACPI_DEBUG_OUTPUT */
 
        return_VALUE(0);
}
 
 
static int
acpi_system_remove_fs (
        struct acpi_device      *device)
{
        ACPI_FUNCTION_TRACE("acpi_system_remove_fs");
 
        if (!device)
                return_VALUE(-EINVAL);
 
        remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_device_dir(device));
        remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_device_dir(device));
        remove_proc_entry(ACPI_SYSTEM_FILE_EVENT, acpi_device_dir(device));
#ifdef CONFIG_ACPI_SLEEP
        remove_proc_entry(ACPI_SYSTEM_FILE_SLEEP, acpi_device_dir(device));
        remove_proc_entry(ACPI_SYSTEM_FILE_ALARM, acpi_device_dir(device));
#endif
#ifdef ACPI_DEBUG_OUTPUT
        remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER,
                acpi_device_dir(device));
        remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL,
                acpi_device_dir(device));
#endif
 
        return_VALUE(0);
}
 
 
/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */
 
#if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_PM)
 
static int po_cb_active;
 
static void acpi_po_tramp(void *x)
{
        acpi_power_off();
}
 
/* Simple wrapper calling power down function. */
static void acpi_sysrq_power_off(int key, struct pt_regs *pt_regs,
        struct kbd_struct *kbd, struct tty_struct *tty)
{
        static struct tq_struct tq = { .routine = acpi_po_tramp };
        if (po_cb_active++)
                return;
        schedule_task(&tq);
}
 
struct sysrq_key_op sysrq_acpi_poweroff_op = {
        .handler =      &acpi_sysrq_power_off,
        .help_msg =     "Off",
        .action_msg =   "Power Off\n"
};
 
#endif  /* CONFIG_MAGIC_SYSRQ */
 
static int
acpi_system_add (
        struct acpi_device      *device)
{
        int                     result = 0;
        acpi_status             status = AE_OK;
        struct acpi_system      *system = NULL;
        u8                      i = 0;
 
        ACPI_FUNCTION_TRACE("acpi_system_add");
 
        if (!device)
                return_VALUE(-EINVAL);
 
        system = kmalloc(sizeof(struct acpi_system), GFP_KERNEL);
        if (!system)
                return_VALUE(-ENOMEM);
        memset(system, 0, sizeof(struct acpi_system));
 
        system->handle = device->handle;
        sprintf(acpi_device_name(device), "%s", ACPI_SYSTEM_DEVICE_NAME);
        sprintf(acpi_device_class(device), "%s", ACPI_SYSTEM_CLASS);
        acpi_driver_data(device) = system;
 
        result = acpi_system_add_fs(device);
        if (result)
                goto end;
 
        printk(KERN_INFO PREFIX "%s [%s] (supports",
                acpi_device_name(device), acpi_device_bid(device));
        for (i=0; i<ACPI_S_STATE_COUNT; i++) {
                u8 type_a, type_b;
                status = acpi_get_sleep_type_data(i, &type_a, &type_b);
                switch (i) {
                case ACPI_STATE_S4:
                        if (acpi_gbl_FACS->S4bios_f &&
 
                                printk(" S4bios");
                                system->states[i] = 1;
                        }
                        /* no break */
                default:
                        if (ACPI_SUCCESS(status)) {
                                system->states[i] = 1;
                                printk(" S%d", i);
                        }
                }
        }
        printk(")\n");
 
#ifdef CONFIG_PM
        /* Install the soft-off (S5) handler. */
        if (system->states[ACPI_STATE_S5]) {
                pm_power_off = acpi_power_off;
                register_sysrq_key('o', &sysrq_acpi_poweroff_op);
        }
#endif
 
end:
        if (result)
                kfree(system);
 
        return_VALUE(result);
}
 
 
static int
acpi_system_remove (
        struct acpi_device      *device,
        int                     type)
{
        struct acpi_system      *system = NULL;
 
        ACPI_FUNCTION_TRACE("acpi_system_remove");
 
        if (!device || !acpi_driver_data(device))
                return_VALUE(-EINVAL);
 
        system = (struct acpi_system *) acpi_driver_data(device);
 
#ifdef CONFIG_PM
        /* Remove the soft-off (S5) handler. */
        if (system->states[ACPI_STATE_S5]) {
                unregister_sysrq_key('o', &sysrq_acpi_poweroff_op);
                pm_power_off = NULL;
        }
#endif
 
        acpi_system_remove_fs(device);
 
        kfree(system);
 
        return 0;
}
 
 
int __init
acpi_system_init (void)
{
        int                     result = 0;
 
        ACPI_FUNCTION_TRACE("acpi_system_init");
 
        result = acpi_bus_register_driver(&acpi_system_driver);
        if (result < 0)
                return_VALUE(-ENODEV);
 
        return_VALUE(0);
}
 
 
void __exit
acpi_system_exit (void)
{
        ACPI_FUNCTION_TRACE("acpi_system_exit");
        acpi_bus_unregister_driver(&acpi_system_driver);
        return_VOID;
}
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [acpi/] [system.c] - Blame information for rev 1774

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* acpi_system.c - ACPI System Driver ($Revision: 1.1.1.1 $)`
3			`*`
4			`* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>`
5			`* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>`
6			`*`
7			`* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
8			`*`
9			`* This program is free software; you can redistribute it and/or modify`
10			`* it under the terms of the GNU General Public License as published by`
11			`* the Free Software Foundation; either version 2 of the License, or (at`
12			`* your option) any later version.`
13			`*`
14			`* This program is distributed in the hope that it will be useful, but`
15			`* WITHOUT ANY WARRANTY; without even the implied warranty of`
16			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
17			`* General Public License for more details.`
18			`*`
19			`* You should have received a copy of the GNU General Public License along`
20			`* with this program; if not, write to the Free Software Foundation, Inc.,`
21			`* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.`
22			`*`
23			`* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
24			`*/`
25
26			`#include <linux/config.h>`
27			`#include <linux/kernel.h>`
28			`#include <linux/module.h>`
29			`#include <linux/init.h>`
30			`#include <linux/types.h>`
31			`#include <linux/spinlock.h>`
32			`#include <linux/poll.h>`
33			`#include <linux/delay.h>`
34			`#include <linux/interrupt.h>`
35			`#include <linux/sysrq.h>`
36			`#include <linux/compatmac.h>`
37			`#include <linux/proc_fs.h>`
38			`#include <linux/pm.h>`
39			`#include <asm/uaccess.h>`
40			`#include <asm/acpi.h>`